Memory Wire is very strong, very hard wire and we have found that memory wire does notch normal jewellery cutters. We also find that the memory wire springs back and stabs the user when cutting with normal cutters as well. Ouch! But not anymore. These memory wire cutters do not notch when used on memory wire and cut cleanly and neatly. These cutters are worth having if you are cutting a lot of memory wire or any tough/hard wire.